Edema... 4 months later

Sammy
I don't feel like a postpartum mummy as baby was delivered by section 9th may... However! I'm hoping that someone may have a similar case or can help me. 
I had servere swelling towards end of my pregnancy and after my section I was worse! So much worse I didn't loose any weight from walking into the hospital! I gained, a lot! A lot of water. After a few weeks of having tree trunk legs and elephant man hands, dr finally gave me some tablets for the water retention and then I felt like a new women...
However... It's come back, and Drs given me more tablets, but hasn't said as to why I'm having this, I've had blood tests done and nothing, anyone know why that can enlighten me please? 
Photo just for cuteness 
Xx